b1 = 4 1/4 in
b2= 3 3/4 in
h= 2 1/2 in
Area = 1/2h (b1+b2)
Replacing:
A = 1/2 *2 1/2 (4 1/4 + 3 3/4 )
A = 1/2 * 5/2 (7 4/4)
A = 5/4 (8 )
A = 40/4
A = 10 in2
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